E17
U.S. Motors
Low Control Voltage / Auxiliary Power Fault
U.S. Motors pool pump controller shows E17 and the display is dim or flickers; pump may shut off unexpectedly.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failing low-voltage power supply on control board, Shorted keypad or accessory drawing excess current, Loose low-voltage connector, Overheated or aged capacitors in auxiliary supply
How to Fix / Troubleshooting
Safety first: Disconnect power before opening the controller housing.
- Inspect low-voltage wiring: Check connectors between the main board and display/keypad for secure fit. Reseat any loose plugs.
- Disconnect accessories: Temporarily disconnect any optional sensors or external modules powered by the pump controller to see if E17 clears.
- Visual inspection: Look for bulging or leaking capacitors in the low-voltage section of the U.S. Motors control board.
- Measure control voltage: If you have the schematic, measure the 5V/12V rails on the board. Low or unstable readings indicate a failing supply.
- Replace control board: Auxiliary power supplies are not typically field-repairable. Replace the pump control board if E17 persists and low-voltage instability is confirmed.
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Repair Difficulty
Hard
4/5
Required Part
Pump Control Board / Low-Voltage Power Supply
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